Relationship between ATM and Ribosomal Protein S6 Revealed by the Chemical Inhibition of Ser/Thr Protein Phosphatase Type 1

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  • LI Ying
    Division of Applied Bioscience, Graduate School of Agriculture, Hokkaido University Division of Applied Bioscience, Graduate School of Agriculture, Hokkaido University
  • MITSUHASHI Shinya
    Division of Applied Bioscience, Graduate School of Agriculture, Hokkaido University Division of Applied Bioscience, Graduate School of Agriculture, Hokkaido University
  • IKEJO Makoto
    Graduate School of Life Science, Hokkaido University Graduate School of Life Science, Hokkaido University
  • MIURA Nobuaki
    Graduate School of Life Science, Hokkaido University Graduate School of Life Science, Hokkaido University
  • KAWAMURA Takeshi
    Research Center for Advanced Science and Technology, The University of Tokyo Research Center for Advanced Science and Technology, The University of Tokyo
  • HAMAKUBO Takao
    Research Center for Advanced Science and Technology, The University of Tokyo Research Center for Advanced Science and Technology, The University of Tokyo
  • UBUKATA Makoto
    Division of Applied Bioscience, Graduate School of Agriculture, Hokkaido University Division of Applied Bioscience, Graduate School of Agriculture, Hokkaido University

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The optimal cellular responses to DNA damage are modulated by kinase and phosphatase. The ataxia telangiectasia mutated (ATM) is a Ser/Thr kinase which is the core of the DNA damage signaling apparatus. The Ser/Thr protein phosphatase type 1 (PP1) inhibitor, tautomycetin (TC) and an antibody to the phospho-(S/T)Q sites of the ATM substrate were used to identify the common substrates for PP1 and ATM in regulating the pathway for DNA damage response. Ribosomal protein S6 (RPS6) was first identified as a substrate for PP1 and ATM. The phosphorylation at Ser247 of RPS6 was then significantly decreased by PP1-mediated dephosphorylation immediately after UV irradiation. These results suggest that PP1 specifically dephosphorylated RPS6 at phospho-Ser247 in vivo. In response to DNA damage, ATM activity was finally required for the phosphorylation of RPS6 at Ser247. We propose from these results a novel mechanism for modulating the RPS6 function by PP1 and ATM which regulates cell growth and survival in response to DNA-damage stimuli.

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